Descent of ManIn this lecture, beginners can familiarize themselves with basic information and terms used to describe the evolution of humanity beginning with the origin of primates through the comings and goings of Genus Homo.

An amino acid, one of the essential ingredients to life on Earth, has been found in a comet for the first time, NASA announced Monday.

Since amino acids have already been discovered in meteorites, this new development, reported at the American Chemical Society meeting in Washington, D.C., suggests that early Earth had plenty of opportunities to have been seeded for life by extraterrestrial bodies.

Scientists concluded nearly two years of painstaking research on comet samples returned by the Stardust probe to confirm that glycine -- one of 20 known amino acids that form the building blocks for life on Earth -- was in the comet Wild 2, and not the result of terrestrial contamination.

"We're interested in understanding the inventory of materials that were available on early Earth when life got started," lead researcher Jamie Elsila, with NASA's Goddard Space Flight Center in Greenbelt, Md., told Discovery News. Full Article : discovery.com